Physics: Work and Displacement

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What is the expression for work done by a force?

F × d

What is the direction of the displacement of the body in Fig 21?

The direction of the force

How is the component of force in the direction of displacement found?

By finding the cosine of the angle between the force and the direction of displacement

What is the angle between the force and the direction of displacement in Fig 22?

9° Signup and view all the answers

What is the purpose of finding the work done by a force?

To find the energy transferred to the body Signup and view all the answers

What is the condition for the work done by a force to be zero?

When there is no displacement or when the displacement is normal to the direction of force. Signup and view all the answers

What happens to the kinetic energy and speed of a body moving in a circular path?

The kinetic energy and speed of the body do not change. Signup and view all the answers

What is the direction of the force acting on a body moving in a horizontal plane?

The force acting on the body is directed towards the center. Signup and view all the answers

What is the work done when the displacement is in a direction opposite to the force?

The work done is negative. Signup and view all the answers

How is the work done determined when the force acting on the body varies during displacement?

By plotting force-displacement graphs. Signup and view all the answers

What is the relationship between the centripetal force and the displacement in a circular path?

The centripetal force is directed towards the center, and the displacement is tangent to the circle. Signup and view all the answers

What is the direction of the force of gravity on a body?

Downwards Signup and view all the answers

What is the formula for the work done by the force of gravity on a body?

W = mgh Signup and view all the answers

Is the work done by the force of gravity dependent on the path taken by the body?

No Signup and view all the answers

What is the unit of work in the CGS system?

Erg Signup and view all the answers

What is the formula for power?

P = W/T Signup and view all the answers

When a body goes up a vertical height, what kind of work is done?

Work against the force of gravity Signup and view all the answers

What is the definition of energy?

The capacity of a body to do work. Signup and view all the answers

What is the difference between energy and work?

Energy is the capacity to do work, while work is the actual act of doing it. Signup and view all the answers

What is the unit of power?

Watt (W) Signup and view all the answers

What is the condition for no transfer of energy?

When a force is normal to the direction of a body's displacement. Signup and view all the answers

What is the relationship between power and energy?

Power is the rate of doing work, or the rate of transfer of energy. Signup and view all the answers

What is the scalar quantity that is related to power and work?

Energy Signup and view all the answers

What is the force required to lift a car of mass 500 kg to a vertical height of 4 m?

4900 N Signup and view all the answers